2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12 #include <linux/bio.h>
13 #include <linux/sched.h>
14 #include <linux/slab.h>
15 #include <linux/spinlock.h>
16 #include <linux/completion.h>
17 #include <linux/buffer_head.h>
18 #include <linux/statfs.h>
19 #include <linux/seq_file.h>
20 #include <linux/mount.h>
21 #include <linux/kthread.h>
22 #include <linux/delay.h>
23 #include <linux/gfs2_ondisk.h>
24 #include <linux/crc32.h>
25 #include <linux/time.h>
26 #include <linux/wait.h>
27 #include <linux/writeback.h>
28 #include <linux/backing-dev.h>
29 #include <linux/kernel.h>
49 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
91 static const match_table_t tokens = {
92 {Opt_lockproto, "lockproto=%s"},
93 {Opt_locktable, "locktable=%s"},
94 {Opt_hostdata, "hostdata=%s"},
95 {Opt_spectator, "spectator"},
96 {Opt_spectator, "norecovery"},
97 {Opt_ignore_local_fs, "ignore_local_fs"},
98 {Opt_localflocks, "localflocks"},
99 {Opt_localcaching, "localcaching"},
100 {Opt_debug, "debug"},
101 {Opt_nodebug, "nodebug"},
102 {Opt_upgrade, "upgrade"},
104 {Opt_noacl, "noacl"},
105 {Opt_quota_off, "quota=off"},
106 {Opt_quota_account, "quota=account"},
107 {Opt_quota_on, "quota=on"},
108 {Opt_quota, "quota"},
109 {Opt_noquota, "noquota"},
110 {Opt_suiddir, "suiddir"},
111 {Opt_nosuiddir, "nosuiddir"},
112 {Opt_data_writeback, "data=writeback"},
113 {Opt_data_ordered, "data=ordered"},
115 {Opt_discard, "discard"},
116 {Opt_nodiscard, "nodiscard"},
117 {Opt_commit, "commit=%d"},
118 {Opt_err_withdraw, "errors=withdraw"},
119 {Opt_err_panic, "errors=panic"},
120 {Opt_statfs_quantum, "statfs_quantum=%d"},
121 {Opt_statfs_percent, "statfs_percent=%d"},
122 {Opt_quota_quantum, "quota_quantum=%d"},
123 {Opt_barrier, "barrier"},
124 {Opt_nobarrier, "nobarrier"},
125 {Opt_rgrplvb, "rgrplvb"},
126 {Opt_norgrplvb, "norgrplvb"},
127 {Opt_loccookie, "loccookie"},
128 {Opt_noloccookie, "noloccookie"},
133 * gfs2_mount_args - Parse mount options
134 * @args: The structure into which the parsed options will be written
135 * @options: The options to parse
140 int gfs2_mount_args(struct gfs2_args *args, char *options)
144 substring_t tmp[MAX_OPT_ARGS];
147 /* Split the options into tokens with the "," character and
151 o = strsep(&options, ",");
157 token = match_token(o, tokens, tmp);
160 match_strlcpy(args->ar_lockproto, &tmp[0],
164 match_strlcpy(args->ar_locktable, &tmp[0],
168 match_strlcpy(args->ar_hostdata, &tmp[0],
172 args->ar_spectator = 1;
174 case Opt_ignore_local_fs:
175 /* Retained for backwards compat only */
177 case Opt_localflocks:
178 args->ar_localflocks = 1;
180 case Opt_localcaching:
181 /* Retained for backwards compat only */
184 if (args->ar_errors == GFS2_ERRORS_PANIC) {
185 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
194 /* Retained for backwards compat only */
197 args->ar_posix_acl = 1;
200 args->ar_posix_acl = 0;
204 args->ar_quota = GFS2_QUOTA_OFF;
206 case Opt_quota_account:
207 args->ar_quota = GFS2_QUOTA_ACCOUNT;
211 args->ar_quota = GFS2_QUOTA_ON;
214 args->ar_suiddir = 1;
217 args->ar_suiddir = 0;
219 case Opt_data_writeback:
220 args->ar_data = GFS2_DATA_WRITEBACK;
222 case Opt_data_ordered:
223 args->ar_data = GFS2_DATA_ORDERED;
229 args->ar_discard = 1;
232 args->ar_discard = 0;
235 rv = match_int(&tmp[0], &args->ar_commit);
236 if (rv || args->ar_commit <= 0) {
237 pr_warn("commit mount option requires a positive numeric argument\n");
238 return rv ? rv : -EINVAL;
241 case Opt_statfs_quantum:
242 rv = match_int(&tmp[0], &args->ar_statfs_quantum);
243 if (rv || args->ar_statfs_quantum < 0) {
244 pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n");
245 return rv ? rv : -EINVAL;
248 case Opt_quota_quantum:
249 rv = match_int(&tmp[0], &args->ar_quota_quantum);
250 if (rv || args->ar_quota_quantum <= 0) {
251 pr_warn("quota_quantum mount option requires a positive numeric argument\n");
252 return rv ? rv : -EINVAL;
255 case Opt_statfs_percent:
256 rv = match_int(&tmp[0], &args->ar_statfs_percent);
257 if (rv || args->ar_statfs_percent < 0 ||
258 args->ar_statfs_percent > 100) {
259 pr_warn("statfs_percent mount option requires a numeric argument between 0 and 100\n");
260 return rv ? rv : -EINVAL;
263 case Opt_err_withdraw:
264 args->ar_errors = GFS2_ERRORS_WITHDRAW;
267 if (args->ar_debug) {
268 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
271 args->ar_errors = GFS2_ERRORS_PANIC;
274 args->ar_nobarrier = 0;
277 args->ar_nobarrier = 1;
280 args->ar_rgrplvb = 1;
283 args->ar_rgrplvb = 0;
286 args->ar_loccookie = 1;
288 case Opt_noloccookie:
289 args->ar_loccookie = 0;
293 pr_warn("invalid mount option: %s\n", o);
302 * gfs2_jindex_free - Clear all the journal index information
303 * @sdp: The GFS2 superblock
307 void gfs2_jindex_free(struct gfs2_sbd *sdp)
309 struct list_head list;
310 struct gfs2_jdesc *jd;
312 spin_lock(&sdp->sd_jindex_spin);
313 list_add(&list, &sdp->sd_jindex_list);
314 list_del_init(&sdp->sd_jindex_list);
315 sdp->sd_journals = 0;
316 spin_unlock(&sdp->sd_jindex_spin);
318 while (!list_empty(&list)) {
319 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
320 gfs2_free_journal_extents(jd);
321 list_del(&jd->jd_list);
327 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
329 struct gfs2_jdesc *jd;
332 list_for_each_entry(jd, head, jd_list) {
333 if (jd->jd_jid == jid) {
345 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
347 struct gfs2_jdesc *jd;
349 spin_lock(&sdp->sd_jindex_spin);
350 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
351 spin_unlock(&sdp->sd_jindex_spin);
356 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
358 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
359 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
360 u64 size = i_size_read(jd->jd_inode);
362 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30))
365 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
367 if (gfs2_write_alloc_required(ip, 0, size)) {
368 gfs2_consist_inode(ip);
375 static int init_threads(struct gfs2_sbd *sdp)
377 struct task_struct *p;
380 p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
383 fs_err(sdp, "can't start logd thread: %d\n", error);
386 sdp->sd_logd_process = p;
388 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
391 fs_err(sdp, "can't start quotad thread: %d\n", error);
394 sdp->sd_quotad_process = p;
398 kthread_stop(sdp->sd_logd_process);
403 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
404 * @sdp: the filesystem
409 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
411 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
412 struct gfs2_glock *j_gl = ip->i_gl;
413 struct gfs2_holder freeze_gh;
414 struct gfs2_log_header_host head;
417 error = init_threads(sdp);
421 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
426 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
428 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
432 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
438 /* Initialize some head of the log stuff */
439 sdp->sd_log_sequence = head.lh_sequence + 1;
440 gfs2_log_pointers_init(sdp, head.lh_blkno);
442 error = gfs2_quota_init(sdp);
446 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
448 gfs2_glock_dq_uninit(&freeze_gh);
453 freeze_gh.gh_flags |= GL_NOCACHE;
454 gfs2_glock_dq_uninit(&freeze_gh);
456 kthread_stop(sdp->sd_quotad_process);
457 kthread_stop(sdp->sd_logd_process);
461 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
463 const struct gfs2_statfs_change *str = buf;
465 sc->sc_total = be64_to_cpu(str->sc_total);
466 sc->sc_free = be64_to_cpu(str->sc_free);
467 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
470 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
472 struct gfs2_statfs_change *str = buf;
474 str->sc_total = cpu_to_be64(sc->sc_total);
475 str->sc_free = cpu_to_be64(sc->sc_free);
476 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
479 int gfs2_statfs_init(struct gfs2_sbd *sdp)
481 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
482 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
483 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
484 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
485 struct buffer_head *m_bh, *l_bh;
486 struct gfs2_holder gh;
489 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
494 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
498 if (sdp->sd_args.ar_spectator) {
499 spin_lock(&sdp->sd_statfs_spin);
500 gfs2_statfs_change_in(m_sc, m_bh->b_data +
501 sizeof(struct gfs2_dinode));
502 spin_unlock(&sdp->sd_statfs_spin);
504 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
508 spin_lock(&sdp->sd_statfs_spin);
509 gfs2_statfs_change_in(m_sc, m_bh->b_data +
510 sizeof(struct gfs2_dinode));
511 gfs2_statfs_change_in(l_sc, l_bh->b_data +
512 sizeof(struct gfs2_dinode));
513 spin_unlock(&sdp->sd_statfs_spin);
521 gfs2_glock_dq_uninit(&gh);
525 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
528 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
529 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
530 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
531 struct buffer_head *l_bh;
536 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
540 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
542 spin_lock(&sdp->sd_statfs_spin);
543 l_sc->sc_total += total;
544 l_sc->sc_free += free;
545 l_sc->sc_dinodes += dinodes;
546 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
547 if (sdp->sd_args.ar_statfs_percent) {
548 x = 100 * l_sc->sc_free;
549 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
550 if (x >= y || x <= -y)
553 spin_unlock(&sdp->sd_statfs_spin);
557 gfs2_wake_up_statfs(sdp);
560 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
561 struct buffer_head *l_bh)
563 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
564 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
565 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
566 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
568 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
569 gfs2_trans_add_meta(m_ip->i_gl, m_bh);
571 spin_lock(&sdp->sd_statfs_spin);
572 m_sc->sc_total += l_sc->sc_total;
573 m_sc->sc_free += l_sc->sc_free;
574 m_sc->sc_dinodes += l_sc->sc_dinodes;
575 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
576 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
577 0, sizeof(struct gfs2_statfs_change));
578 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
579 spin_unlock(&sdp->sd_statfs_spin);
582 int gfs2_statfs_sync(struct super_block *sb, int type)
584 struct gfs2_sbd *sdp = sb->s_fs_info;
585 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
586 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
587 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
588 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
589 struct gfs2_holder gh;
590 struct buffer_head *m_bh, *l_bh;
594 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
599 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
603 spin_lock(&sdp->sd_statfs_spin);
604 gfs2_statfs_change_in(m_sc, m_bh->b_data +
605 sizeof(struct gfs2_dinode));
606 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
607 spin_unlock(&sdp->sd_statfs_spin);
610 spin_unlock(&sdp->sd_statfs_spin);
612 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
616 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
620 update_statfs(sdp, m_bh, l_bh);
621 sdp->sd_statfs_force_sync = 0;
630 gfs2_glock_dq_uninit(&gh);
637 struct list_head list;
638 struct gfs2_holder gh;
642 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
644 * @sdp: the file system
645 * @state: the state to put the transaction lock into
646 * @t_gh: the hold on the transaction lock
651 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
652 struct gfs2_holder *freeze_gh)
654 struct gfs2_inode *ip;
655 struct gfs2_jdesc *jd;
658 struct gfs2_log_header_host lh;
661 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
662 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
667 ip = GFS2_I(jd->jd_inode);
668 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
673 list_add(&lfcc->list, &list);
676 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
677 GL_NOCACHE, freeze_gh);
679 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
680 error = gfs2_jdesc_check(jd);
683 error = gfs2_find_jhead(jd, &lh);
686 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
693 gfs2_glock_dq_uninit(freeze_gh);
696 while (!list_empty(&list)) {
697 lfcc = list_entry(list.next, struct lfcc, list);
698 list_del(&lfcc->list);
699 gfs2_glock_dq_uninit(&lfcc->gh);
705 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
707 struct gfs2_dinode *str = buf;
709 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
710 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
711 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
712 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
713 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
714 str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
715 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
716 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
717 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
718 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
719 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
720 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
721 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
722 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
724 str->di_goal_meta = cpu_to_be64(ip->i_goal);
725 str->di_goal_data = cpu_to_be64(ip->i_goal);
726 str->di_generation = cpu_to_be64(ip->i_generation);
728 str->di_flags = cpu_to_be32(ip->i_diskflags);
729 str->di_height = cpu_to_be16(ip->i_height);
730 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
731 !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
733 str->di_depth = cpu_to_be16(ip->i_depth);
734 str->di_entries = cpu_to_be32(ip->i_entries);
736 str->di_eattr = cpu_to_be64(ip->i_eattr);
737 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
738 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
739 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
743 * gfs2_write_inode - Make sure the inode is stable on the disk
745 * @wbc: The writeback control structure
750 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
752 struct gfs2_inode *ip = GFS2_I(inode);
753 struct gfs2_sbd *sdp = GFS2_SB(inode);
754 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
755 struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
758 if (wbc->sync_mode == WB_SYNC_ALL)
759 gfs2_log_flush(GFS2_SB(inode), ip->i_gl, NORMAL_FLUSH);
760 if (bdi->wb.dirty_exceeded)
761 gfs2_ail1_flush(sdp, wbc);
763 filemap_fdatawrite(metamapping);
764 if (wbc->sync_mode == WB_SYNC_ALL)
765 ret = filemap_fdatawait(metamapping);
767 mark_inode_dirty_sync(inode);
772 * gfs2_dirty_inode - check for atime updates
773 * @inode: The inode in question
774 * @flags: The type of dirty
776 * Unfortunately it can be called under any combination of inode
777 * glock and transaction lock, so we have to check carefully.
779 * At the moment this deals only with atime - it should be possible
780 * to expand that role in future, once a review of the locking has
784 static void gfs2_dirty_inode(struct inode *inode, int flags)
786 struct gfs2_inode *ip = GFS2_I(inode);
787 struct gfs2_sbd *sdp = GFS2_SB(inode);
788 struct buffer_head *bh;
789 struct gfs2_holder gh;
791 int need_endtrans = 0;
794 if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC)))
797 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
798 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
800 fs_err(sdp, "dirty_inode: glock %d\n", ret);
804 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
807 if (current->journal_info == NULL) {
808 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
810 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
816 ret = gfs2_meta_inode_buffer(ip, &bh);
818 gfs2_trans_add_meta(ip->i_gl, bh);
819 gfs2_dinode_out(ip, bh->b_data);
827 gfs2_glock_dq_uninit(&gh);
831 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
832 * @sdp: the filesystem
837 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
839 struct gfs2_holder freeze_gh;
842 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
844 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
847 kthread_stop(sdp->sd_quotad_process);
848 kthread_stop(sdp->sd_logd_process);
850 flush_workqueue(gfs2_delete_workqueue);
851 gfs2_quota_sync(sdp->sd_vfs, 0);
852 gfs2_statfs_sync(sdp->sd_vfs, 0);
854 gfs2_log_flush(sdp, NULL, SHUTDOWN_FLUSH);
855 wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0);
856 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
858 if (gfs2_holder_initialized(&freeze_gh))
859 gfs2_glock_dq_uninit(&freeze_gh);
861 gfs2_quota_cleanup(sdp);
867 * gfs2_put_super - Unmount the filesystem
868 * @sb: The VFS superblock
872 static void gfs2_put_super(struct super_block *sb)
874 struct gfs2_sbd *sdp = sb->s_fs_info;
876 struct gfs2_jdesc *jd;
878 /* No more recovery requests */
879 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
882 /* Wait on outstanding recovery */
884 spin_lock(&sdp->sd_jindex_spin);
885 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
886 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
888 spin_unlock(&sdp->sd_jindex_spin);
889 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
890 TASK_UNINTERRUPTIBLE);
893 spin_unlock(&sdp->sd_jindex_spin);
895 if (!(sb->s_flags & MS_RDONLY)) {
896 error = gfs2_make_fs_ro(sdp);
900 /* At this point, we're through modifying the disk */
904 iput(sdp->sd_jindex);
905 iput(sdp->sd_statfs_inode);
906 iput(sdp->sd_rindex);
907 iput(sdp->sd_quota_inode);
909 gfs2_glock_put(sdp->sd_rename_gl);
910 gfs2_glock_put(sdp->sd_freeze_gl);
912 if (!sdp->sd_args.ar_spectator) {
913 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
914 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
915 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
916 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
917 iput(sdp->sd_sc_inode);
918 iput(sdp->sd_qc_inode);
921 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
922 gfs2_clear_rgrpd(sdp);
923 gfs2_jindex_free(sdp);
924 /* Take apart glock structures and buffer lists */
925 gfs2_gl_hash_clear(sdp);
926 /* Unmount the locking protocol */
927 gfs2_lm_unmount(sdp);
929 /* At this point, we're through participating in the lockspace */
930 gfs2_sys_fs_del(sdp);
934 * gfs2_sync_fs - sync the filesystem
935 * @sb: the superblock
937 * Flushes the log to disk.
940 static int gfs2_sync_fs(struct super_block *sb, int wait)
942 struct gfs2_sbd *sdp = sb->s_fs_info;
944 gfs2_quota_sync(sb, -1);
946 gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
950 void gfs2_freeze_func(struct work_struct *work)
953 struct gfs2_holder freeze_gh;
954 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
955 struct super_block *sb = sdp->sd_vfs;
957 atomic_inc(&sb->s_active);
958 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
961 printk(KERN_INFO "GFS2: couln't get freeze lock : %d\n", error);
962 gfs2_assert_withdraw(sdp, 0);
965 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
966 error = thaw_super(sb);
968 printk(KERN_INFO "GFS2: couldn't thaw filesystem: %d\n",
970 gfs2_assert_withdraw(sdp, 0);
972 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
973 freeze_gh.gh_flags |= GL_NOCACHE;
974 gfs2_glock_dq_uninit(&freeze_gh);
976 deactivate_super(sb);
981 * gfs2_freeze - prevent further writes to the filesystem
982 * @sb: the VFS structure for the filesystem
986 static int gfs2_freeze(struct super_block *sb)
988 struct gfs2_sbd *sdp = sb->s_fs_info;
991 mutex_lock(&sdp->sd_freeze_mutex);
992 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
995 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
1001 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
1007 fs_err(sdp, "waiting for recovery before freeze\n");
1011 fs_err(sdp, "error freezing FS: %d\n", error);
1015 fs_err(sdp, "retrying...\n");
1020 mutex_unlock(&sdp->sd_freeze_mutex);
1025 * gfs2_unfreeze - reallow writes to the filesystem
1026 * @sb: the VFS structure for the filesystem
1030 static int gfs2_unfreeze(struct super_block *sb)
1032 struct gfs2_sbd *sdp = sb->s_fs_info;
1034 mutex_lock(&sdp->sd_freeze_mutex);
1035 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
1036 !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
1037 mutex_unlock(&sdp->sd_freeze_mutex);
1041 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
1042 mutex_unlock(&sdp->sd_freeze_mutex);
1047 * statfs_fill - fill in the sg for a given RG
1049 * @sc: the sc structure
1051 * Returns: 0 on success, -ESTALE if the LVB is invalid
1054 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1055 struct gfs2_statfs_change_host *sc)
1057 gfs2_rgrp_verify(rgd);
1058 sc->sc_total += rgd->rd_data;
1059 sc->sc_free += rgd->rd_free;
1060 sc->sc_dinodes += rgd->rd_dinodes;
1065 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1066 * @sdp: the filesystem
1067 * @sc: the sc info that will be returned
1069 * Any error (other than a signal) will cause this routine to fall back
1070 * to the synchronous version.
1072 * FIXME: This really shouldn't busy wait like this.
1077 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1079 struct gfs2_rgrpd *rgd_next;
1080 struct gfs2_holder *gha, *gh;
1081 unsigned int slots = 64;
1086 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1087 gha = kmalloc(slots * sizeof(struct gfs2_holder), GFP_KERNEL);
1090 for (x = 0; x < slots; x++)
1091 gfs2_holder_mark_uninitialized(gha + x);
1093 rgd_next = gfs2_rgrpd_get_first(sdp);
1098 for (x = 0; x < slots; x++) {
1101 if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
1102 err = gfs2_glock_wait(gh);
1104 gfs2_holder_uninit(gh);
1108 error = statfs_slow_fill(
1109 gh->gh_gl->gl_object, sc);
1110 gfs2_glock_dq_uninit(gh);
1114 if (gfs2_holder_initialized(gh))
1116 else if (rgd_next && !error) {
1117 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1121 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1125 if (signal_pending(current))
1126 error = -ERESTARTSYS;
1140 * gfs2_statfs_i - Do a statfs
1141 * @sdp: the filesystem
1142 * @sg: the sg structure
1147 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1149 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1150 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1152 spin_lock(&sdp->sd_statfs_spin);
1155 sc->sc_total += l_sc->sc_total;
1156 sc->sc_free += l_sc->sc_free;
1157 sc->sc_dinodes += l_sc->sc_dinodes;
1159 spin_unlock(&sdp->sd_statfs_spin);
1161 if (sc->sc_free < 0)
1163 if (sc->sc_free > sc->sc_total)
1164 sc->sc_free = sc->sc_total;
1165 if (sc->sc_dinodes < 0)
1172 * gfs2_statfs - Gather and return stats about the filesystem
1173 * @sb: The superblock
1174 * @statfsbuf: The buffer
1176 * Returns: 0 on success or error code
1179 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1181 struct super_block *sb = dentry->d_sb;
1182 struct gfs2_sbd *sdp = sb->s_fs_info;
1183 struct gfs2_statfs_change_host sc;
1186 error = gfs2_rindex_update(sdp);
1190 if (gfs2_tune_get(sdp, gt_statfs_slow))
1191 error = gfs2_statfs_slow(sdp, &sc);
1193 error = gfs2_statfs_i(sdp, &sc);
1198 buf->f_type = GFS2_MAGIC;
1199 buf->f_bsize = sdp->sd_sb.sb_bsize;
1200 buf->f_blocks = sc.sc_total;
1201 buf->f_bfree = sc.sc_free;
1202 buf->f_bavail = sc.sc_free;
1203 buf->f_files = sc.sc_dinodes + sc.sc_free;
1204 buf->f_ffree = sc.sc_free;
1205 buf->f_namelen = GFS2_FNAMESIZE;
1211 * gfs2_remount_fs - called when the FS is remounted
1212 * @sb: the filesystem
1213 * @flags: the remount flags
1214 * @data: extra data passed in (not used right now)
1219 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1221 struct gfs2_sbd *sdp = sb->s_fs_info;
1222 struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1223 struct gfs2_tune *gt = &sdp->sd_tune;
1226 sync_filesystem(sb);
1228 spin_lock(>->gt_spin);
1229 args.ar_commit = gt->gt_logd_secs;
1230 args.ar_quota_quantum = gt->gt_quota_quantum;
1231 if (gt->gt_statfs_slow)
1232 args.ar_statfs_quantum = 0;
1234 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1235 spin_unlock(>->gt_spin);
1236 error = gfs2_mount_args(&args, data);
1240 /* Not allowed to change locking details */
1241 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1242 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1243 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1246 /* Some flags must not be changed */
1247 if (args_neq(&args, &sdp->sd_args, spectator) ||
1248 args_neq(&args, &sdp->sd_args, localflocks) ||
1249 args_neq(&args, &sdp->sd_args, meta))
1252 if (sdp->sd_args.ar_spectator)
1253 *flags |= MS_RDONLY;
1255 if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1256 if (*flags & MS_RDONLY)
1257 error = gfs2_make_fs_ro(sdp);
1259 error = gfs2_make_fs_rw(sdp);
1264 sdp->sd_args = args;
1265 if (sdp->sd_args.ar_posix_acl)
1266 sb->s_flags |= MS_POSIXACL;
1268 sb->s_flags &= ~MS_POSIXACL;
1269 if (sdp->sd_args.ar_nobarrier)
1270 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1272 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1273 spin_lock(>->gt_spin);
1274 gt->gt_logd_secs = args.ar_commit;
1275 gt->gt_quota_quantum = args.ar_quota_quantum;
1276 if (args.ar_statfs_quantum) {
1277 gt->gt_statfs_slow = 0;
1278 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1281 gt->gt_statfs_slow = 1;
1282 gt->gt_statfs_quantum = 30;
1284 spin_unlock(>->gt_spin);
1286 gfs2_online_uevent(sdp);
1291 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1292 * @inode: The inode to drop
1294 * If we've received a callback on an iopen lock then its because a
1295 * remote node tried to deallocate the inode but failed due to this node
1296 * still having the inode open. Here we mark the link count zero
1297 * since we know that it must have reached zero if the GLF_DEMOTE flag
1298 * is set on the iopen glock. If we didn't do a disk read since the
1299 * remote node removed the final link then we might otherwise miss
1300 * this event. This check ensures that this node will deallocate the
1301 * inode's blocks, or alternatively pass the baton on to another
1302 * node for later deallocation.
1305 static int gfs2_drop_inode(struct inode *inode)
1307 struct gfs2_inode *ip = GFS2_I(inode);
1309 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
1311 gfs2_holder_initialized(&ip->i_iopen_gh)) {
1312 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1313 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
1316 return generic_drop_inode(inode);
1319 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1325 } while (!IS_ROOT(d1));
1330 * gfs2_show_options - Show mount options for /proc/mounts
1331 * @s: seq_file structure
1332 * @root: root of this (sub)tree
1334 * Returns: 0 on success or error code
1337 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1339 struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1340 struct gfs2_args *args = &sdp->sd_args;
1343 if (is_ancestor(root, sdp->sd_master_dir))
1344 seq_puts(s, ",meta");
1345 if (args->ar_lockproto[0])
1346 seq_show_option(s, "lockproto", args->ar_lockproto);
1347 if (args->ar_locktable[0])
1348 seq_show_option(s, "locktable", args->ar_locktable);
1349 if (args->ar_hostdata[0])
1350 seq_show_option(s, "hostdata", args->ar_hostdata);
1351 if (args->ar_spectator)
1352 seq_puts(s, ",spectator");
1353 if (args->ar_localflocks)
1354 seq_puts(s, ",localflocks");
1356 seq_puts(s, ",debug");
1357 if (args->ar_posix_acl)
1358 seq_puts(s, ",acl");
1359 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1361 switch (args->ar_quota) {
1362 case GFS2_QUOTA_OFF:
1365 case GFS2_QUOTA_ACCOUNT:
1375 seq_printf(s, ",quota=%s", state);
1377 if (args->ar_suiddir)
1378 seq_puts(s, ",suiddir");
1379 if (args->ar_data != GFS2_DATA_DEFAULT) {
1381 switch (args->ar_data) {
1382 case GFS2_DATA_WRITEBACK:
1383 state = "writeback";
1385 case GFS2_DATA_ORDERED:
1392 seq_printf(s, ",data=%s", state);
1394 if (args->ar_discard)
1395 seq_puts(s, ",discard");
1396 val = sdp->sd_tune.gt_logd_secs;
1398 seq_printf(s, ",commit=%d", val);
1399 val = sdp->sd_tune.gt_statfs_quantum;
1401 seq_printf(s, ",statfs_quantum=%d", val);
1402 else if (sdp->sd_tune.gt_statfs_slow)
1403 seq_puts(s, ",statfs_quantum=0");
1404 val = sdp->sd_tune.gt_quota_quantum;
1406 seq_printf(s, ",quota_quantum=%d", val);
1407 if (args->ar_statfs_percent)
1408 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1409 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1412 switch (args->ar_errors) {
1413 case GFS2_ERRORS_WITHDRAW:
1416 case GFS2_ERRORS_PANIC:
1423 seq_printf(s, ",errors=%s", state);
1425 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1426 seq_puts(s, ",nobarrier");
1427 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1428 seq_puts(s, ",demote_interface_used");
1429 if (args->ar_rgrplvb)
1430 seq_puts(s, ",rgrplvb");
1431 if (args->ar_loccookie)
1432 seq_puts(s, ",loccookie");
1436 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1438 struct inode *inode = &ip->i_inode;
1439 struct gfs2_glock *gl = ip->i_gl;
1441 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1442 truncate_inode_pages(&inode->i_data, 0);
1444 if (atomic_read(&gl->gl_revokes) == 0) {
1445 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1446 clear_bit(GLF_DIRTY, &gl->gl_flags);
1450 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1452 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1453 struct gfs2_rgrpd *rgd;
1454 struct gfs2_holder gh;
1457 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1458 gfs2_consist_inode(ip);
1462 error = gfs2_rindex_update(sdp);
1466 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1470 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1472 gfs2_consist_inode(ip);
1477 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1481 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1482 sdp->sd_jdesc->jd_blocks);
1484 goto out_rg_gunlock;
1486 gfs2_free_di(rgd, ip);
1488 gfs2_final_release_pages(ip);
1490 gfs2_trans_end(sdp);
1493 gfs2_glock_dq_uninit(&gh);
1495 gfs2_quota_unhold(ip);
1500 * gfs2_evict_inode - Remove an inode from cache
1501 * @inode: The inode to evict
1503 * There are three cases to consider:
1504 * 1. i_nlink == 0, we are final opener (and must deallocate)
1505 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1508 * If the fs is read only, then we have to treat all cases as per #3
1509 * since we are unable to do any deallocation. The inode will be
1510 * deallocated by the next read/write node to attempt an allocation
1511 * in the same resource group
1513 * We have to (at the moment) hold the inodes main lock to cover
1514 * the gap between unlocking the shared lock on the iopen lock and
1515 * taking the exclusive lock. I'd rather do a shared -> exclusive
1516 * conversion on the iopen lock, but we can change that later. This
1517 * is safe, just less efficient.
1520 static void gfs2_evict_inode(struct inode *inode)
1522 struct super_block *sb = inode->i_sb;
1523 struct gfs2_sbd *sdp = sb->s_fs_info;
1524 struct gfs2_inode *ip = GFS2_I(inode);
1525 struct gfs2_holder gh;
1526 struct address_space *metamapping;
1529 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1534 if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
1537 /* Must not read inode block until block type has been verified */
1538 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1539 if (unlikely(error)) {
1540 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1541 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1542 gfs2_holder_uninit(&ip->i_iopen_gh);
1546 if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1547 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1552 if (test_bit(GIF_INVALID, &ip->i_flags)) {
1553 error = gfs2_inode_refresh(ip);
1558 if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1559 test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1560 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1561 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1562 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE,
1564 error = gfs2_glock_nq(&ip->i_iopen_gh);
1569 /* Case 1 starts here */
1571 if (S_ISDIR(inode->i_mode) &&
1572 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1573 error = gfs2_dir_exhash_dealloc(ip);
1579 error = gfs2_ea_dealloc(ip);
1584 if (!gfs2_is_stuffed(ip)) {
1585 error = gfs2_file_dealloc(ip);
1590 error = gfs2_dinode_dealloc(ip);
1594 gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH);
1595 metamapping = gfs2_glock2aspace(ip->i_gl);
1596 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1597 filemap_fdatawrite(metamapping);
1598 filemap_fdatawait(metamapping);
1600 write_inode_now(inode, 1);
1601 gfs2_ail_flush(ip->i_gl, 0);
1603 /* Case 2 starts here */
1604 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1607 /* Needs to be done before glock release & also in a transaction */
1608 truncate_inode_pages(&inode->i_data, 0);
1609 truncate_inode_pages(metamapping, 0);
1610 gfs2_trans_end(sdp);
1613 /* Error path for case 1 */
1614 if (gfs2_rs_active(&ip->i_res))
1615 gfs2_rs_deltree(&ip->i_res);
1617 if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1618 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1619 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1620 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1622 gfs2_holder_uninit(&ip->i_iopen_gh);
1624 gfs2_glock_dq_uninit(&gh);
1625 if (error && error != GLR_TRYFAILED && error != -EROFS)
1626 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1628 /* Case 3 starts here */
1629 truncate_inode_pages_final(&inode->i_data);
1630 gfs2_rsqa_delete(ip, NULL);
1631 gfs2_ordered_del_inode(ip);
1633 gfs2_dir_hash_inval(ip);
1634 ip->i_gl->gl_object = NULL;
1635 flush_delayed_work(&ip->i_gl->gl_work);
1636 gfs2_glock_add_to_lru(ip->i_gl);
1637 gfs2_glock_put(ip->i_gl);
1639 if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1640 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1641 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1642 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1643 gfs2_holder_uninit(&ip->i_iopen_gh);
1647 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1649 struct gfs2_inode *ip;
1651 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1656 memset(&ip->i_res, 0, sizeof(ip->i_res));
1657 RB_CLEAR_NODE(&ip->i_res.rs_node);
1660 return &ip->i_inode;
1663 static void gfs2_i_callback(struct rcu_head *head)
1665 struct inode *inode = container_of(head, struct inode, i_rcu);
1666 kmem_cache_free(gfs2_inode_cachep, inode);
1669 static void gfs2_destroy_inode(struct inode *inode)
1671 call_rcu(&inode->i_rcu, gfs2_i_callback);
1674 const struct super_operations gfs2_super_ops = {
1675 .alloc_inode = gfs2_alloc_inode,
1676 .destroy_inode = gfs2_destroy_inode,
1677 .write_inode = gfs2_write_inode,
1678 .dirty_inode = gfs2_dirty_inode,
1679 .evict_inode = gfs2_evict_inode,
1680 .put_super = gfs2_put_super,
1681 .sync_fs = gfs2_sync_fs,
1682 .freeze_super = gfs2_freeze,
1683 .thaw_super = gfs2_unfreeze,
1684 .statfs = gfs2_statfs,
1685 .remount_fs = gfs2_remount_fs,
1686 .drop_inode = gfs2_drop_inode,
1687 .show_options = gfs2_show_options,